Guerrero H Y, Caceres G, Paiva C L, Marcano D
Department of Physiology, J. M. Vargas Medical School, Universidad Central de Venezuela, Caracas.
Gen Comp Endocrinol. 1990 Nov;80(2):257-63. doi: 10.1016/0016-6480(90)90170-q.
The catecholamines noradrenaline (NA), dopamine (DA), and adrenaline (A) were measured in hypothalamic and telencephalic extracts of the Venezuelan freshwater fish "caribe colorado," Pygocentrus notatus, at different stages of the reproductive cycle. The concentration of NA was found to be significantly higher in the telencephalon than in the hypothalamus, but that of DA was higher in the hypothalamus than in the telencephalon. Fluctuations depending upon the reproductive stage and environmental conditions occurred in both hypothalamus and telencephalon. In the hypothalamus, DA content was highest during the prespawning period (June) as compared to other periods of the cycle. Although the NA concentration was reduced during spawning there was no significant variation during any other period. DA concentrations in both telencephalon and hypothalamus showed a similar pattern of changes. In the telencephalon, NA levels increased between preparatory and prespawning periods but decreased sharply during spawning. No sex differences were observed in either area at any stage of reproduction.
在委内瑞拉淡水鱼“红腹食人鱼”（Pygocentrus notatus）生殖周期的不同阶段，对其下丘脑和端脑提取物中的儿茶酚胺类物质去甲肾上腺素（NA）、多巴胺（DA）和肾上腺素（A）进行了测定。结果发现，端脑中NA的浓度显著高于下丘脑，但下丘脑中DA的浓度高于端脑。下丘脑和端脑中均出现了取决于生殖阶段和环境条件的波动。在下丘脑中，与生殖周期的其他时期相比，产卵前期（6月）的DA含量最高。虽然产卵期间NA浓度降低，但在其他任何时期均无显著变化。端脑和下丘脑中DA浓度的变化模式相似。在端脑中，NA水平在准备期和产卵前期之间升高，但在产卵期间急剧下降。在生殖的任何阶段，两个区域均未观察到性别差异。
